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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<link rel="stylesheet" href="themes.css" />
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<article class="container">
<p>
Lorem ipsum dolor sit, amet consectetur adipisicing elit. Illo
necessitatibus neque officia voluptates fugit ipsa tempora quidem
perferendis repudiandae vero sequi quos dignissimos quasi molestiae
porro architecto, officiis odio aperiam.
</p>
</article>
<section>
<p>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Delectus
inventore neque ab quos. Nulla expedita veniam corporis recusandae iste
voluptatibus aliquam eum, commodi, quas quam placeat numquam vero totam
corrupti?
</p>
</section>
<section>
<p>
Lorem ipsum dolor sit amet consectetur adipisicing elit. Delectus
inventore neque ab quos. Nulla expedita veniam corporis recusandae iste
voluptatibus aliquam eum, commodi, quas quam placeat numquam vero totam
corrupti?
</p>
</section>
<button id="change">Dark theme</button>
<script>
const applyTheme = theme => {
let out = "";
Object.keys(theme).forEach(k => (out += `--${k}: ${theme[k]};`));
return out;
};
let dark = false;
const themes = {
light: {
background: "#fff",
text: "#000"
},
dark: {
background: "#000",
text: "#fff"
}
};
document.body.setAttribute("style", applyTheme(themes.light));
document.querySelector("#change").addEventListener("click", e => {
if (dark) {
document.body.setAttribute("style", applyTheme(themes.light));
dark = false;
e.currentTarget.innerText = "Dark Theme";
} else {
document.body.setAttribute("style", applyTheme(themes.dark));
dark = true;
e.currentTarget.innerText = "Light Theme";
}
});
</script>
</body>
</html>